[btilly]

Making this concrete, eugenics is based on the idea that breeding for the characteristics that we think are desirable will lead to better humans. However the characteristics that we think are desirable are often more connected with prejudice than anything desirable. And in the process of breeding for any one characteristic we often accidentally pull in others we don't like so much.

Lest this seem like merely a theoretical point, read https://dogbehaviorscience.wordpress.com/2012/09/29/100-year... to see how this has played out in dog breeds.

Eugenics would clearly accomplish something. It is unlikely that that something would be desirable.